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Yorkshire Quaker Heritage Project, "Library of the Religious Society of Friends," [3]: "[Library of the Religious Society of Friends] holds the central archives of Britain Yearly Meeting, the major Quaker periodicals and monograph publications, as well as manuscripts and pictures. Particularly important items include the Great Books of Sufferings, Quarterly Meeting returns of sufferings, the Wensleydale Journal of Norman Penney, numerous printed tracts, and the virtually unique Dictionary of Quaker Biography."

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Judith Jennings, "The Business of Abolishing the British Slave Trade, 1783-1807,": 17-21, 31-32, 96-97, 136

Judith Jennings, "Gender, Religion, And Radicalism in the Long Eighteenth Century: The 'ingenious Quaker' and Her Connections,": 44, 47, 141-142, 161-163

David Brion Davis, "The Problem of Slavery in the Age of Revolution, 1770-1823,": 234, 236-237

Thomas Bender, "The Antislavery Debate: Capitalism and Abolitionism as a Problem in Historical Interpretation,": 46, 48